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An eminent educator and professional journalist have joined hands to create this highly readable, nontechnical book which treats the selective factors operative on past, present and future human populations. Its aim is to increase the reader's awareness that present-day man, like other animals, is a constantly evolving organism, and that his cultural and biological evolution is being affected by current environmental problems. Integrating a biological and anthropological approach, the book presents a broad perspective on how environmental degradation may affect the evolution and survival of contemporary man. -- from back cover.